Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9e33287a4c70107c56cdc5216599eb90808fd544d31e8f85253bcb3582ffb6' 
  AND token = 'SF1hlm6eiRlSc++Kuv7gtUJUzsrRGkhcS32O7oY2D5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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