SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded6269e8eb97df7f13878a27928d658d1877460af8b24c238ea89867531dd92' 
  AND token = 'dzZlb8R0KXhwiwoYW5yVQxY4Z4ofFivDufdlSSBQwTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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