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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0721d627856205403466995f49b79d110948e1613eda6a2d972fdd39561122' 
  AND token = '5wdW6qOAsnHOZRtOLaZ36OI0ts3qQK8kkKXiR7KPv/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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