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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99a8c6073844898b23140c32f22815935a996a96361d2516e55abc8fa715b04' 
  AND token = 'PNCV14YN2LevPWcr+uPlfdyyU5svv3kJ0AK39QtIPhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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