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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dfe7b0d83d2a4f34a77034a20bfc61f09e5642cc9c869648b11d8fa085849ca' 
  AND token = 'V2Hw3glCu9bsqoPx2FAIbUgG5RlJ40WsK8JRl1ll6F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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