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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169eed095b1e73f2ff5a6edf029974e2b48a2068602f1d380becea357d39eb32' 
  AND token = 'N2zqHzu6B9AFvamGzSImzGTgN9nP7sHT/4ojfsgx8js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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