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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b95a36365a7734dece977a215ae3e5504f3cac72362af8558f699b5a968f2d' 
  AND token = 'a5joLOFs8X8iaSTFEZVtybQ+5nOZJYpP0J24dDp41rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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