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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a8f07848d1387e8503e21b429b3ed07a33e4ef27a84b2add7d1861dec47e20' 
  AND token = 'fz4KA8Xa/r+seCFqVDcSkek7Wa2qNY3Zlz9GWMXoeYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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