Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f25d192e49e0c6a1c6af2bc04f26e82ded887ad481b16c0a8fe2dc340922ac' 
  AND token = 'MxFyR01uUCBsghl2T66SoPiSTbC76LgM18WKYq1O66w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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