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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97acb42ba72109931a46e1d0cce801d34ec1da82953798343c122e212faa9506' 
  AND token = 'Aj57k2Xi1v1mh/tkzQPJnvbQAFCgKby5/1B6ms2OJ5g=' 
  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"
    }
  }
}