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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce8ea1980655d8c53c0a48951df8d7764b9cc3ef8df51c00854f0c20befa312' 
  AND token = 'iAd/FCvGjVU9RnnQVWXq94O1lreAe2PO/F9Au1tQvkM=' 
  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"
    }
  }
}