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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314894a2ab47267a0eea6ed3cbfcb9450ef91f251f515e348cc3fdab4a06ed93' 
  AND token = 'zK4Ra8FLBn4msI7DB1TTl+dzwDOe58LovLjtEFWIYsw=' 
  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"
    }
  }
}