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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783f9f10af0b42b8835573e5fb7e4763619e68000f8c8abf98799004fa18db71' 
  AND token = 'jxx8Rya+DytyN0i1T5kkG7FWa4zJYtyvdsXNLcL74GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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