SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '227d21c985190ec29de1cdc481d4c13cbf43fa345f9d8b7a8035b685a9e3c2f9' 
  AND token = 'Gy+bqCXsijwFphRngnCofCCYM/b7zVslv7NXO2mfvKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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