SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c3c35637c7ab697e9c9a9ca869a9e712e9a483a916c9034ef609d1508b1fb6' 
  AND token = 'hbMEbkIZiRyFxVJJonqZ3tFbBpYrQvu8jGUXjhztzAo=' 
  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"
    }
  }
}