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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa39c8d748cc98d34d8cf40d6a324d9871cdf76ebe4cd5ed655a5ac5e513e15f' 
  AND token = 'oOlU5LV7+De2Aa/Jju3M3gdI6ZBrjI4mV53kbj8Rdo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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