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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3d86dd64e2b22758ec1d551b8e18ea127cf360e2cd36ef51493c8c975e5f5d' 
  AND token = '1buRCj+RxeNbFxyb6bmPQIAZJNzOmcAufydkOJtJoeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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