Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670972a9cfae0a2de6735b19363582f3e3d08b24446a13385409c2a57e957eaf' 
  AND token = 'NmBz1or8BCgqbehWajW5Em9GchPFe4Xn0FKxJlsFy8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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