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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b46ee5b6c0bf7ae601160b261e6b165916a8f5535979e0dcb302ebdaa0f6e0' 
  AND token = 'GqOc9tqoTxenrTqbmC3GVF31IM3IxWUqLf4OGaAgv1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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