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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc19a141e70b39c295096d9e17d0412070ab91ae9e10f32396bf93cb3114d21' 
  AND token = 'CPQzpCowsCmyRFiX+6w4KqVyV2yl3OgQ0WbbF8smERU=' 
  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"
    }
  }
}