SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdae580c09bde392f4ae83f91dd600b0124a8374f5693d6ff55ebcc291877530' 
  AND token = 'w/sbS1KHzPrOfXCojRHSiS6WWWuijg8JDgTkvtWwYfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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