SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a9ebf748bf6399f36431c4e5a0243366132e47b42fd77245bd21226c8cb9a5' 
  AND token = 'NJzD2kqRSNIWj1DayPB8wIThc5olGrDyvKpfhmJTSJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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