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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ad240d915be5e86815c0491efb37347a0924b35344aecf18d66fcf0d361637' 
  AND token = 'AlpFddK3e8/9yzgDpo+7U+eJ3P9Xk9xv4tqvVfKxDLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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