Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e375ce9dbb4c767138bf58e30b0f988f1b2aebb9c67cf53f7d8656faceb3035' 
  AND token = 'n1i7V5JqU+drHaEPjU1reTMJKZuZ2cBgiW9u6Ie4Z50=' 
  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"
    }
  }
}