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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565c7f9d56f17014536eb931e7df446dec78740984a287530a75e7cbc1c6b4fb' 
  AND token = 'tf3ET/HXyxrPYier6L8XiYxSgxq57edr/bWV7zLJLGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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