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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1193d10281a503c100aec5ba2b608492229a09240b3670024ae09d8d5865ea1' 
  AND token = 'QMZpiEWJVUc5SPX+aeOd6Sq8zihBVtp8S3jfxPZYltg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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