Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ec0e4a4bc50f144504a103851ea2d17484d4ff853af0959f90f7a084409747' 
  AND token = 'Y1hpGdwxeR3F/+DOZa0PHSbR5OM2TriSIBmAsd3nmaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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