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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa94c0d7269e241542b68240e03cd5cb267819065208fafa2cc3d4c921a2889' 
  AND token = '04gedm3l5SE/r6lVsJP46GQKVXH/jiLHfnx/oor/7zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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