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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337f8ae042728c6ddf8dd28fc060ff7c27683097b55752bcefa1fc096defa09f' 
  AND token = 'ukFyaED816V/YNuBvg4JVo2HSdnlK8AVQOgR6R61FXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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