SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aae6d071a800e61ea184b54fa52d8a788ec5c23ecddbd83c961fab1d21e6913' 
  AND token = 'URpf9qEMIuJQVLcU/q1dZdgShrG1hoD7BbFzXjGwas4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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