Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caaf32dddd70697e569a842e90cb417c51d18334d4b1d973315892039a90cf1a' 
  AND token = 'pgp4Lu3s22YebTtYtbqbcRH5BOKtXU13/RP8/Xdu12M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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