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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baebd31c239031ba42a685048a5c86ea99a5fc624b4bb00e5540963e7ea8c137' 
  AND token = 'QLRfatoFuyJ5L8haW09YTF83axf61z6vpBK0dWceci8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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