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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5b7fb74bf61c333c51205016d3d176f1e21a86d9b8d33c2a957c046ba27967' 
  AND token = 'tuq01O8Ej0vwOv2iQBm0sJsalye47wCO3EZa4QsDvK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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