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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fb641cdf371f35ffe6fc6c3eec77628d02648520bfc24114028a6b815caaf2' 
  AND token = 'I8lWaXym/9VdJDNxDc0VzSgQVlTgWKxq3N4CXOEJug0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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