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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fbf526e61a7bb6b52a3f83ba0f2707acd808cb60c5095b36cdc1c399ff0956' 
  AND token = 'dF2AND2xXJANIpITuu4PvzcJ/94doYiwtJ/M+SpfQXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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