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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538b2718088e216f8d67ec469fe7ce78d1598e27353e35e942518dc6439d07c9' 
  AND token = 'ZU1XK0nbaoqTCfB6AD+u6pneviOgt1iT/+RpeOuD5Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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