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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f369a1ee7cde47040b9f2199ccb77627ea44915d67aa4468a8542d69e2da459' 
  AND token = 'HJCIwDWfKKS0ExDZqKPkpH+y2R9ub0HKubTT/YTBHLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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