Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b76604c12c7b9a829ab1cccc83edeb28d1a9456fc0b2785731379b83e07d11' 
  AND token = '9Scej4vdBlz1TQPEjMZFSeRzh30rimkZ2nX4XvJueuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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