Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8695849f5e660402cc09ba9cda9fc7d17bab61904bda5247a5b1cef0ede1654f' 
  AND token = 'V0foQvIwkPRt+ERSLvIA5S9+yQvt4mVgcUEC5R/Rao8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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