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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f8a4ceb6c54162327e7e8f776231a6ef1cc704984feaf3635c016ec1289521' 
  AND token = 'XN5rG3ytAs0AFgZzfcw0DCCyqFdjBu2GQaoqS+QDHu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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