Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28fda79f9d3a0d5bdade780b2ee520964e54ce97fa0fd31af1073be9647ced0' 
  AND token = '08b84r0CWx/sMDJaZ9XY0rsdi5wn10sux22L86TcGY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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