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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e923e2e09ca1ca6fc509a35900f8d0ff24998e76299eefa78fe8f7ffa053ff' 
  AND token = 'kdJ5lXH8smDc3n0YYN2RuhIMFVfKfLSsyRZIzVN1sJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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