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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a90b6a3f61239f57a3e6a43d027186f99750f61f20b9b68ac5aece8b525d72b' 
  AND token = 'QlWFijVbMvg/VSeexapUidTtmW6N7EFqyMia00xWta8=' 
  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"
    }
  }
}