Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8aabd17ca428c87cea95cd3dbaf4243f9fa78a68ddc1c7c78c5398d11e1020' 
  AND token = 'o9AtZd0rYDyeVkHkjF+qzGxAYL2+unp5J9ID0D/QSoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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