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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffad5a58acab88e358ba6829308ff3aa45598d139d93c275e477bba7802f280f' 
  AND token = '6SfYoVyRyX/tGIkurp6D7BgGq/tfg8RIdtssRlSryJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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