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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ebf0d4ea207faf86bfe5b51b27709ec8324ccfb63c6a76b33393c77e661e8c' 
  AND token = 'OEkaDM9q+D118Hpa/EQMnbAdV6ltkBO912tQeaSnAWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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