Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff9f79794c58867ac497136b67720fb4fe69a0fc7d9d662a450acb081ac2cee' 
  AND token = 'ZKa1xPvgc3ZoAObsm9xCYZmE6JG2gXBl2X6N/LtD0ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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