SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d60ef0b14ca5cac562513447e331542a65dc286f00b3b892ca2f49f833bad7' 
  AND token = 'wjzYy8pLSxE1qbpWxwnBv+w8F8elVtruUFQeJ+iM5Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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