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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa494c04e83aef691d08e9541df21ff6162cb1020d464442dca2fb3a9dcb4fc5' 
  AND token = 'TQflfwroaE4Nk8+vQ2uCB7FYPnjk9oBOi0AwsWC2g08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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