SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc0145262e6bad7e4834368029ef220099fec1b29d7af297d8bdecd35ef761f' 
  AND token = 'tsDfpinzbjP+dRDAXBZM/VUzzGfT+h4+B1JLOzHcLow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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