SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0410a7f290e27e76cd3b510ec2e4b3a416f463a63141dd75333bd3da5e6ec0e' 
  AND token = 'cLq5ZgAtFRu/wT+KiABBGXqoGMhGUw8vhUZNHjYcvE4=' 
  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"
    }
  }
}