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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f410c6b2e5068310ac7a64556ec5e354607f3d853a31939c38248974840de8b7' 
  AND token = '8aZkyEaoiWglRV++mrq0fTXbU6ORK1aKgpR5CmXp03M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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