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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1904f4071017ef43f05d73a2782071830674477ca1c712d64a0fc679e09843b1' 
  AND token = '0lZAAjYCiMMGC0xscI71vpsBb0Bz/JrBD3UBQ5nrQQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}