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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35074ba8aa8fff3afcdfbbcb72cf22a5bb73f13244191ece1588c1ea821be921' 
  AND token = '5DS/MuxvAJX2edyjEaYxMD1O3m29ddAHAUs5q2KPBzc=' 
  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"
    }
  }
}