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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea28bbc22ce39ee0ae4a79de66bd1cee9db4bd8e15fa7f78cb4cbd4dfbd50d7' 
  AND token = 'UlGMgS9bCgV0naiMIrxU6e5wd6+YA68Co8Ks8ZAXBGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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