Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c8b68d078735c2c39eef39f28cfc06c19d1135998ec3169ff94757a9cfc670' 
  AND token = 'VEDRo1XgDYoAhLxYIq3Nr4eEUSDNgRKQAxN1B9pOmR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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