Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99fc61fc075eafdb0af4cea5d9d703ce722426c4621d2c9c31c6b895aec3af24' 
  AND token = 'Lu6T6EqDLdHv9VeBhBJ11FDWIMTQYiRiUhKk8rl6CTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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