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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3611404ebe822820d37dbf265158eb3d799b9cc5c7102e40c8387fc21e221fe0' 
  AND token = 'WZpRGtqJr2dXb+0+INKLmN3hqbYe49Y9R6zWa4/Z3fc=' 
  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"
    }
  }
}